Unexpected Bendy Bone behavior. #108845
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Reference: blender/blender#108845
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System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 535.98
Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash:
e1ccd9d4a1d3Short description of error
Bendy bones with stretch-to constraints seem to have an issue where if the head of the bendy bone is exactly at the pivot of the start handle the bone does not inherit the rotation. Moving the handles or the head of the bone even 0.001 will fix this.
Exact steps for others to reproduce the error
bendy_GOOD) has slightly offset bendy bone heads, right side bendy bone chain (bendy_BAD) heads are at the exact position of the handle pivots.Thank you!
Left side bendy bone chain (bendy_GOOD) has slightly offset bendy bone headsis probably the reason why it failed to compute correct interpolation. Because the default handle type isAbsolute, which uses "the position of the specific bone to compute the handle". If the deviation is zero then it's not possible to have a valid vector as the direction of the handle. So this is not a bug.Changing the handle type to "Tangent" could solve the problem since this mode only uses the rotation of the bone.